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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am currently using Smoothwall as a firewall and want to block certain adult internet sites, I can do this using their IP address in IPchains but they often rotate the IP address, can you block an IP via it's DNS entry (i.e. it's web address) and if so how.
Thanks

Even tho you could maintain it by feeding a list of sitenames in /etc/hosts or the firewall itself or use a browser like Opera that supports domainname filters, IMO it's easier to maintain if you use a proxy like Privoxy, Squid or the like because with a few regexes you'll speed up surfing banning out adds and smut. Just like blackholing spamhauses for smtp, there are sites that maintain lists of site/path regexes for proxies.

DansGuardian sits between the browsers and the internet, filtering eveything from ip numbers to names to attachments to words in pages.
A very complete product.
Daniel Barron has also made a commercial version for Smoothwall, but the original hack is still floating around.
Maybe some money for the good work is appropriate here...